OwnerRez' Guests system allows the same guest to be associated with multiple inquiries, quotes, and bookings. That makes it easy for you to identify repeat guests and be extra nice to them.
But we all make mistakes. What do you do if you accidentally associate a new inquiry with an existing guest, when in reality it was someone else with, say, the same name?
You need to go through each of those bookings and split them out to the correct new guest. To do that, open the booking and click Guest Record > Associate with different guest:
Type in the name of the new guest and select the "+Add" option:
Click "Create Guest & Use" button at the bottom. The system will create a new, standalone guest record (with the new information) and link the current booking with the new guest record.